glGetMap man page on DigitalUNIX

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glGetMap(3G)							  glGetMap(3G)

NAME
       glGetMap, glGetMapdv, glGetMapfv, glGetMapiv - return evaluator parame‐
       ters

SYNOPSIS
       void glGetMapdv(
	       GLenum target,
	       GLenum query,
	       GLdouble *v ); void glGetMapfv(
	       GLenum target,
	       GLenum query,
	       GLfloat *v ); void glGetMapiv(
	       GLenum target,
	       GLenum query,
	       GLint *v );

PARAMETERS
       Specifies  the  symbolic	 name  of   a	map.   Accepted	  values   are
       GL_MAP1_COLOR_4,	    GL_MAP1_INDEX,     GL_MAP1_NORMAL,	  GL_MAP1_TEX‐
       TURE_COORD_1,	 GL_MAP1_TEXTURE_COORD_2,     GL_MAP1_TEXTURE_COORD_3,
       GL_MAP1_TEXTURE_COORD_4,	      GL_MAP1_VERTEX_3,	     GL_MAP1_VERTEX_4,
       GL_MAP2_COLOR_4,	   GL_MAP2_INDEX,     GL_MAP2_NORMAL,	  GL_MAP2_TEX‐
       TURE_COORD_1,	 GL_MAP2_TEXTURE_COORD_2,     GL_MAP2_TEXTURE_COORD_3,
       GL_MAP2_TEXTURE_COORD_4, GL_MAP2_VERTEX_3, and GL_MAP2_VERTEX_4.	 Spec‐
       ifies which parameter to return. Symbolic names GL_COEFF, GL_ORDER, and
       GL_DOMAIN are accepted.	Returns the requested data.

DESCRIPTION
       glMap1() and glMap2() define evaluators.	 glGetMap() returns  evaluator
       parameters.   target chooses a map, query selects a specific parameter,
       and v points to storage where the values will be returned.

       The acceptable values for the target parameter  are  described  in  the
       glMap1() and glMap2() reference pages.

       query can assume the following values: v returns the control points for
       the evaluator function. One-dimensional evaluators return order control
       points,	and two-dimensional evaluators return uorder times vorder con‐
       trol points. Each control point consists of one, two,  three,  or  four
       integer, single-precision floating-point, or double-precision floating-
       point values, depending on the type of the evaluator.  The  GL  returns
       two-dimensional	control	 points	 in  row-major order, incrementing the
       uorder index quickly and the vorder index after each row. Integer  val‐
       ues,  when  requested,  are computed by rounding the internal floating-
       point values to the nearest integer values.  v returns the order of the
       evaluator  function.  One-dimensional evaluators return a single value,
       order. The initial value is 1.  Two-dimensional evaluators  return  two
       values,	uorder	and  vorder.  The initial value is 1,1.	 v returns the
       linear u and v mapping parameters.  One-dimensional  evaluators	return
       two values, u1 and u2, as specified by glMap1(). Two-dimensional evalu‐
       ators return four values (u1, u2, v1, and v2) as specified by glMap2().
       Integer	values,	 when requested, are computed by rounding the internal
       floating-point values to the nearest integer values.

NOTES
       If an error is generated, no change is made to the contents of v.

ERRORS
       GL_INVALID_ENUM is generated if	either	target	or  query  is  not  an
       accepted value.

       GL_INVALID_OPERATION is generated if glGetMap() is executed between the
       execution of glBegin() and the corresponding execution of glEnd().

SEE ALSO
       glEvalCoord(3), glMap1(3), glMap2(3)

								  glGetMap(3G)
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